Officers were called to a residence on North Pontiac Drive Sunday around 10 p.m. regarding a fight.

Upon arrival, police found a man had been stabbed and Clayton Courtney, 28, trying to run from the scene.

"My eldest son knows the guy. He used to hang out with him even, and he said he never suspected him to do anything like that," neighbor John Harlow said.

Investigators determined Courtney had attempted to start a vehicle on fire prior to the fight and also damaged kitchen cabinets inside the home.

Police said that Courtney said "I've already killed three people tonight. We are all going to die."

"If we take Mr. Courtney at his word, then we would have concerns that there are two additional deceased persons," Janesville Police Chief David Moore said.

Investigators said that when Courtney was apprehended, he was covered in blood and mud. They said the mud was not consistent with the crime scene on North Pontiac Drive.

Police believe that Courtney was in the area of the Memorial Street Bridge in Janesville earlier in the evening. He told friends he was going there to drink and do drugs with a female friend under the bridge.

Monday morning, officers located the body of a woman behind the former Schuler Furniture Store at 533 N. Main St. Investigators believe the woman is likely in her 30s, and that the body is not that of a 75-year-old Mary Coulthard, who went missing on Saturday.

Coulthard's brother said she volunteered in homeless shelters.

"She was a very kind person. She would give you her shirt off her back. If she didn't have something, she'd get it for you. That was just the kind of person she was," Jerry Quincy, said.

Her brother said police found her purse in a garbage can. Coulthard has three daughters.

Anyone with information regarding Courtney's whereabouts over the weekend, or any information about Coulthard, are asked to call Janesville police at 608-755-3100.

A JANESVILLE MAN MAKES A STUNNING ADMISSION...AFTER HE IS ARRESTED FOR STABBING HIS ROOMMATE. HE SAYS HE ALREADY KILLED THREE PEOPLE. AS 12 NEWS TERRY SATER REPORTS, POLICE ARE INVESTIGATING WHETHER THIS SUSPECT IS RESPONSIBLE FOR THE DEATH OF A WOMAN, WHOSE BODY WAS FOUND THIS WEEKEND. TERRY SATER ON CAMERA - POLICE SAY IT WAS IN A HOME ALONG THIS JANESVILLE STREET WHERE A MAN WAS BRUTALLY STABBED SUNDAY NIGHT. THE SUSPECT SAID HE'D ALREADY KILLED THREE PEOPLE. THE MAN WHO SAID HE'D KILLED THREE PEOPLE IS 28 YEAR CLAYTON COURTNEY. JANESVILLE INVESTIGATORS SAY COURTNEY STABBED A MAN SEVERAL TIMES.. NEARLY KILLING THE VICTIM.. THEN AT DAYBREAK MONDAY, POLICE FOUND A WOMAN'S BODY ALONG THE ROCK RIVER IN JANESVILLE. A SQUAD CAR PARKED THERE TO KEEP WATCH ON THE CRIME SCENE AND POLICE SAY THEY FEAR THERE COULD BE MORE VICTIMS: CHIEF DAVID MOORE: "IF WE TAKE MR COURTNEY AT HIS WORD THEN WE WOULD HAVE CONCERNS THAT THERE ARE TWO ADDITIONAL DECEASED PERSONS." JOHN HARLOW/ JANESVILLE NEIGHBOR - EVERYTHING'S HAPPENED ALL AT ONCE. IT'S LIKE WOW, WHAT THE HECK IS GOING ON. JOHN HARLOW LIVES JUST AROUND THE CORNER FROM THE SCENE OF THE STABBING. NOW HE'S WONDERING IF HIS SON KNOWS THE MAN WHO IS BEING INVESTIGATED FOR A STABBING AND IN THE WOMAN'S DEATH: JOHN HARLOW/ JANESVILLE NEIGHBOR - MY ELDEST SON KNOWS THE GUY. HE USED TO HANG OUT WITH HIM EVEN. AND HE SAID HE NEVER SUSPECTED HIM TO DO ANYTHING LIKE THAT. AS DETECTIVES SEARCHED FOR EVIDENCE ALONG THE RIVER.. THEY'RE ALSO TRYING TO FIGURE OUT THE CONNECTIONS BETWEEN THE CRIME SCENES AND THE MAN WHO IS IN CUSTODY. IN JANESVILLE, TERRY SATER, WISN 12 NEWS.

A Justice Department civil rights investigation has concluded that the Ferguson Police Department and the city's municipal court engaged in a "pattern and practice" of discrimination against African-Americans, targeting them disproportionately for tr...